Cherry Sour Kriek Airlock issue

[Common763]

I have two 5 carboys fermenting the kriek. The one airlock keeps losing water at a high rate (i.e. refilling 2-3 times a week). When I add water it drips into carboy. I replaced airlock and is now doing the same with the next one. When I pulled out the plug that holds airlock in it fit into carboy but pulled out easier than expected...It fits good but not super tight. Anyone have suggestions? It appears pellicle is forming at top of beer.

 

[microbusbrewery]

Is it a three-piece airlock? I would suspect a crack...but the chances of the new one also being cracked is pretty low, so I'm kind of stumped too.

Assuming it's a three-piece, I'd recommend trying one of the S bubble type airlocks. IME they seem to work better for aging; they lose water at a slower rate, and if you don't overfill them they won't suck back fluid with temp fluctuations.